[8.10](backport #3268) [Upgrade Watcher] Try restarting Agent in multiple ways during rollback

[mergify]

This is an automatic backport of pull request #3268 done by Mergify.

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[elasticmachine]

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• Start Time: 2023-08-29T06:05:22.856+0000

• Duration: 29 min 27 sec

Test stats 🧪

Test	Results
Failed	0
Passed	6217
Skipped	47
Total	6264

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[elasticmachine]

🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	98.765% (80/81)	👍
Files	67.368% (192/285)	👍
Classes	66.105% (353/534)	👍
Methods	52.896% (1105/2089)	👍
Lines	38.538% (12613/32729)	👎 -0.021
Conditionals	100.0% (0/0)	💚

[elasticmachine]

Pinging @elastic/elastic-agent (Team:Elastic-Agent)